CN221326633U - Current temperature drift calibrating device - Google Patents
Current temperature drift calibrating device Download PDFInfo
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- CN221326633U CN221326633U CN202322898836.5U CN202322898836U CN221326633U CN 221326633 U CN221326633 U CN 221326633U CN 202322898836 U CN202322898836 U CN 202322898836U CN 221326633 U CN221326633 U CN 221326633U
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Abstract
The utility model discloses a current temperature drift calibration device, which comprises: a temperature sensor, a current temperature drift calibration circuit and a processor; the current temperature drift calibration circuit comprises: a current sampling circuit, a voltage sampling circuit and a voltage detection component; the temperature sensor is electrically connected with the processor; the current sampling circuit is electrically connected with the voltage sampling circuit, the voltage sampling circuit is electrically connected with the voltage detection assembly, and the voltage detection assembly is electrically connected with the processor; the temperature sensor is used for acquiring the temperature of the circuit to be calibrated and sending the temperature to the processor; the current sampling circuit is used for measuring the sampling current of a to-be-calibrated end of the to-be-calibrated circuit, the voltage sampling circuit is used for converting the sampling current into an collectable sampling voltage, and the voltage detection component is used for measuring the sampling voltage and sending the sampling voltage to the processor. According to the utility model, the current of the end to be calibrated of the circuit to be calibrated is corrected, so that the influence of temperature change on current measurement is eliminated, and the measurement accuracy and stability of the current are improved.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a current temperature drift calibration device.
Background
In modern industrial automation control systems, it is important to measure the output signal of the circuit, since the measurement results directly affect the performance of the entire control system. However, due to environmental temperature variations, etc., errors may occur in the output signal of the measurement circuit, which are called temperature drift errors. The temperature drift error may cause performance degradation of the control system, thereby affecting product quality.
Disclosure of utility model
The utility model aims to overcome the defect of complicated steps for eliminating temperature drift errors of circuits in the prior art, and provides a current temperature drift calibration device.
The utility model solves the technical problems by the following technical scheme:
The utility model provides a current temperature drift calibration device, which comprises: a temperature sensor, a current temperature drift calibration circuit and a processor;
The current temperature drift calibration circuit comprises: a current sampling circuit, a voltage sampling circuit and a voltage detection component;
The temperature sensor is electrically connected with the processor; the current sampling circuit is electrically connected with the voltage sampling circuit, the voltage sampling circuit is electrically connected with the voltage detection assembly, and the voltage detection assembly is electrically connected with the processor;
the temperature sensor is used for acquiring the temperature of the circuit to be calibrated and sending the temperature to the processor;
the current sampling circuit is used for measuring the sampling current of a to-be-calibrated end of the to-be-calibrated circuit, the voltage sampling circuit is used for converting the sampling current into an collectable sampling voltage, and the voltage detection component is used for measuring the sampling voltage and sending the sampling voltage to the processor.
Optionally, the current temperature drift calibration device includes: a high-precision constant current source;
the high-precision constant current source is electrically connected with the current sampling circuit.
Optionally, the current sampling circuit includes: a current transformer;
The primary side of the current transformer is connected with the end to be calibrated of the circuit to be calibrated, and the secondary side of the current transformer is connected with one end of the voltage sampling circuit.
Optionally, the voltage sampling circuit includes: and (5) sampling the resistor.
Optionally, the sampling resistor includes: a first resistor and a second resistor; the first resistor and the second resistor are connected in parallel.
Optionally, the resistance value range of the sampling resistor is 0.5-1 ohm.
Optionally, the voltage detection assembly includes: an AD conversion chip;
The AD conversion chip is electrically connected with the processor.
Optionally, the current temperature drift calibration device further includes: a display;
The display is electrically connected with the processor.
Optionally, the current temperature drift calibration device further includes: a memory;
the memory is electrically connected with the processor.
Optionally, the temperature sensor, the current temperature drift calibration circuit, the processor and the memory are integrated on one circuit board.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.
The utility model has the positive progress effects that: according to the utility model, the current of the end to be calibrated of the circuit to be calibrated is corrected to eliminate the influence of temperature change on the current detection result, so that the measurement accuracy and stability of the current are improved, the current measurement result is more accurate and stable, and the production efficiency and the product quality are further improved.
Drawings
FIG. 1 is a schematic block diagram of a current temperature drift calibration device according to an embodiment of the present utility model;
Fig. 2 is a schematic block diagram of another current temperature drift calibration device according to another embodiment of the present utility model.
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
The embodiment of the utility model provides a current temperature drift calibration device, referring to fig. 1, the current temperature drift calibration device comprises: a temperature sensor 11, a processor 12 and a current temperature drift calibration circuit 13.
The current temperature drift calibration circuit 13 includes: a current sampling circuit, a voltage sampling circuit, and a voltage detection component.
The temperature sensor 11 is electrically connected with the processor 12, the current sampling circuit is electrically connected with the voltage sampling circuit, the voltage sampling circuit is electrically connected with the voltage detection assembly, and the voltage detection assembly is electrically connected with the processor 12.
The temperature sensor 11 is used to acquire the temperature at the circuit to be calibrated and sends it to the processor 12.
The current sampling circuit is used for measuring the sampling current of the end to be calibrated of the circuit to be calibrated, the voltage sampling circuit is used for converting the sampling current into the sampling voltage which can be acquired, and the voltage detection component is used for measuring the sampling voltage and sending the sampling voltage to the processor 12.
The current sampling circuit is used for providing a sampling current of a terminal to be calibrated to the voltage sampling circuit, the sampling current flows through the voltage sampling circuit, the voltage sampling circuit provides a generated sampling voltage to the voltage detection component, and the voltage detection component automatically measures the flowing sampling voltage and sends the flowing sampling voltage to the processor 12. The processor in this embodiment is implemented by using an MCU, which may be specifically selected according to practical situations, and is not particularly limited herein.
Because elements such as resistance and capacitance in the circuit to be calibrated can cause the change of circuit parameters along with the change of temperature, the current measurement precision is affected, and the current detection precision and the current detection stability are improved by carrying out temperature compensation on the circuit. The temperature sensor 11 may include a thermistor and an analog-to-digital converter, or may be a temperature sensor having an analog-to-digital conversion function built in, and is specifically selected according to the actual situation, and is not particularly limited herein.
Specifically, under different temperatures, the resistance value of the temperature sensor 11 changes with the temperature, and the output voltage signal is different due to the difference of the resistance value of the temperature sensor 11, and then the voltage signal is converted into a digital signal and sent to the processor 12. The processor 12 processes the digital signal sent by the temperature sensor 11 and the current output by the current sampling circuit, multiplies the current output by the current sampling circuit at different temperatures by the current deviation coefficients at different temperatures, and calculates the obtained calibration result as the actual accurate current of the circuit to be detected.
It should be noted that, referring to the description of the related art, the present utility model does not relate to an improvement of the algorithm for current calibration.
In this embodiment, the current of the end to be calibrated of the circuit to be calibrated is corrected to eliminate the influence of temperature change on the current detection result, so that the measurement accuracy and stability of the current are improved, the current measurement result is more accurate and stable, and the production efficiency and the product quality are improved.
In one embodiment, the current temperature drift calibration device comprises: high precision constant current source. The high-precision constant current source is electrically connected with the current sampling circuit.
In the environments with different temperatures, the high-precision constant current source is used for charging and discharging, a current reference value displayed by the high-precision constant current source is obtained, and current deviation coefficients at different temperatures are calculated according to the current reference value and the current value of the current sampling circuit. The current value of the current sampling circuit is the charge and discharge current of the high-precision constant current source.
Specifically, the difference between the current reference value and the current value of the current sampling circuit is a current deviation value, and the current deviation value is divided by the current reference value to obtain a current deviation coefficient.
In this embodiment, environments with different temperatures are manufactured through the high-low temperature cabinet, a high-precision constant current source with the precision of 0.001A is adopted to charge 0-100A current, and model parameters of equipment and the high-precision constant current source for manufacturing the environments with different temperatures can be set according to actual conditions, and are not particularly limited herein.
In this embodiment, the current reference value is displayed through the high-precision constant current source, so that the calculation of the current deviation coefficient is facilitated, the output current of the circuit is corrected by using the current deviation coefficient, so as to eliminate the influence of temperature change on the current detection result, thereby improving the measurement precision and stability of the current, enabling the current measurement result to be more accurate and stable, and further improving the production efficiency and the product quality.
It should be noted that, referring to a description of related art, a specific algorithm for correcting an output current of a circuit by using a current deviation coefficient, the present utility model does not relate to an algorithm improvement for correcting an output current of a circuit by using a current deviation coefficient.
In one embodiment, a current sampling circuit includes: a current transformer 21. The primary side of the current transformer is connected with the end to be calibrated of the circuit to be calibrated, and the secondary side of the current transformer is connected with one end of the voltage sampling circuit.
Since most of the current at the end to be calibrated of the circuit to be calibrated is relatively large, direct measurement is dangerous, and the current can be measured by using the meter used for measuring the current at most in tens of amperes, the current transformer 21 can change the current at the larger end to be calibrated into smaller sampling current, and the sampling current is measured, so that the current at the end to be calibrated is safely measured.
The current transformer 21 converts a large current into a small sampling current through a proportion, and measures the current value of the current sampling circuit, namely the charging and discharging current of the high-precision constant current source while ensuring the safety of the circuit.
In this embodiment, the current value of the current sampling circuit is measured by the current transformer 21, so that the calculation of the current deviation coefficient is facilitated, the output current of the circuit is corrected by using the current deviation coefficient, so as to eliminate the influence of temperature change on the current detection result, and meanwhile, the safety of the circuit is protected, and the relay protection function is played.
In one embodiment, a voltage sampling circuit includes: and a sampling resistor 22.
The sampling resistor may be a high-precision resistor to reduce the resistance error of the resistor, and may be specifically selected according to practical situations, which is not particularly limited herein.
In this embodiment, a sampling current flows through the sampling resistor 22, and the sampling resistor 22 converts the sampling current into a collectable sampling voltage, so that the voltage detection component can measure the sampling voltage and send the measurement voltage to the processor 12.
In one embodiment, sampling resistor 22 comprises: a first resistor and a second resistor; the first resistor and the second resistor are connected in parallel.
Since the resistor is a vulnerable element, it is often damaged due to overload, overheat, etc. When a plurality of sampling resistors 22 are connected in parallel, if one of the sampling resistors 22 is damaged, the rest of the sampling resistors 22 can still work normally, thereby increasing the fault tolerance of the circuit.
When the resistance of the voltage sampling circuit needs to be adjusted, the voltage sampling circuit can be adjusted by connecting sampling resistors 22 with different resistances in parallel, so that the required resistance is achieved.
In this embodiment, the first resistor and the second resistor are connected in parallel, so that the fault tolerance of the circuit is improved, the resistance value of the voltage sampling circuit is convenient to adjust, the sampling current is converted into the sampling voltage which can be acquired, and the voltage detection assembly can measure the sampling voltage.
In one embodiment, the sampling resistor 22 has a resistance ranging from 0.5 to 1 ohm.
In this embodiment, a sampling current flows through the sampling resistor 22, and the sampling resistor 22 converts the sampling current into a collectable sampling voltage, so that the voltage detection component can measure the sampling voltage and send the measurement voltage to the processor 12.
In one embodiment, the voltage detection assembly includes: an AD conversion chip 23. The AD conversion chip 23 is electrically connected to the processor 12.
The AD conversion chip 23 is used for converting an analog signal of the sampling voltage into a digital signal and transmitting the digital signal to the processor 12. The digital signals may be used to operate or work the meter, computer peripheral interface or processor 12.
In this embodiment, the AD conversion chip 23 collects the sampled voltage flowing through the sampling resistor 22, and converts the analog signal of the sampled voltage into the digital signal required by the processor 12, so as to facilitate the processing of the processor 12.
In one embodiment, the current temperature drift calibration device further comprises: a display. Wherein the display is electrically connected to the processor 12.
Specifically, the display is used for outputting the calibration result.
In this embodiment, through setting up the display, show the calibration result, the user of being convenient for in time looks over the calibration result directly perceivedly, improves the intelligent degree of electric current temperature drift calibrating device, promotes the use and experiences.
In one embodiment, the current temperature drift calibration device further comprises: a memory 24. Wherein the memory 24 is electrically connected to the processor 12.
Specifically, the processor 12 sends the calculated correspondence between the temperature and the current deviation coefficient to the memory 24, and the memory 24 stores the correspondence between the temperature and the current deviation coefficient.
In this embodiment, the corresponding relationship between the temperature and the current deviation coefficient is stored in the memory 24, so that the current temperature drift calibration can be directly invoked and used in the subsequent current temperature drift calibration, and the efficiency of the current temperature drift calibration is improved.
In one embodiment, the temperature sensor, the current temperature drift calibration circuit, the processor, and the memory are integrated on one circuit board.
In the embodiment, the temperature sensor, the current temperature drift calibration circuit, the processor and the memory are integrated on the same circuit board, so that the interference of external electric signals is reduced, the circuit design is greatly improved, and the application is more convenient.
Referring to fig. 2, the working principle of the current temperature drift calibration device is further described.
The current transformer 21 in the current sampling circuit is used for providing a sampling current to the sampling resistor 22 in the voltage sampling circuit, the sampling current flows through the sampling resistor 22, the sampling resistor 22 provides the generated sampling voltage to the AD conversion chip 23 in the voltage detection component, and the AD conversion chip 23 automatically measures the flowing sampling voltage and sends the flowing sampling voltage to the processor 12.
In the case of different temperatures, the voltage signal output from the temperature sensor 11 is measured, and converted into a digital signal, and transmitted to the processor 12. The processor 12 processes the digital signal sent by the temperature sensor 11 and the current output by the current sampling circuit, multiplies the current output by the current sampling circuit at different temperatures by the current deviation coefficients at different temperatures, and calculates the obtained calibration result as the actual accurate current of the circuit to be detected.
In this embodiment, the output current of the circuit is corrected to eliminate the influence of temperature variation on the current detection result, so as to improve the measurement accuracy and stability of the current, make the current measurement result more accurate and stable, and further improve the production efficiency and product quality.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.
Claims (10)
1. A current temperature drift calibration device, characterized in that the current temperature drift calibration device comprises: a temperature sensor, a current temperature drift calibration circuit and a processor;
The current temperature drift calibration circuit comprises: a current sampling circuit, a voltage sampling circuit and a voltage detection component;
The temperature sensor is electrically connected with the processor; the current sampling circuit is electrically connected with the voltage sampling circuit, the voltage sampling circuit is electrically connected with the voltage detection assembly, and the voltage detection assembly is electrically connected with the processor;
the temperature sensor is used for acquiring the temperature of the circuit to be calibrated and sending the temperature to the processor;
The current sampling circuit is used for sampling the sampling current of the end to be calibrated of the circuit to be calibrated, the voltage sampling circuit is used for converting the sampling current into sampling voltage, and the voltage detection component is used for measuring the sampling voltage and sending the sampling voltage to the processor.
2. The current temperature drift calibration device of claim 1, wherein the current temperature drift calibration device comprises: a high-precision constant current source;
the high-precision constant current source is electrically connected with the current sampling circuit.
3. The current temperature drift calibration device of claim 1, wherein the current sampling circuit comprises: a current transformer;
The primary side of the current transformer is connected with the end to be calibrated of the circuit to be calibrated, and the secondary side of the current transformer is connected with one end of the voltage sampling circuit.
4. The current temperature drift calibration device of claim 1, wherein the voltage sampling circuit comprises: and (5) sampling the resistor.
5. The current temperature drift calibration device of claim 4, wherein the sampling resistor comprises: a first resistor and a second resistor; the first resistor and the second resistor are connected in parallel.
6. The apparatus of claim 4, wherein the sampling resistor has a resistance ranging from 0.5 to 1 ohm.
7. The current temperature drift calibration device of claim 1, wherein the voltage detection assembly comprises: an AD conversion chip;
The AD conversion chip is electrically connected with the processor.
8. The current temperature drift calibration device of claim 1, further comprising: a display;
The display is electrically connected with the processor.
9. The current temperature drift calibration device according to any one of claims 1-8, further comprising: a memory;
the memory is electrically connected with the processor.
10. The current temperature drift calibration device of claim 9, wherein the temperature sensor, the current temperature drift calibration circuit, the processor, and the memory are integrated on a circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322898836.5U CN221326633U (en) | 2023-10-27 | 2023-10-27 | Current temperature drift calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322898836.5U CN221326633U (en) | 2023-10-27 | 2023-10-27 | Current temperature drift calibrating device |
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| Publication Number | Publication Date |
|---|---|
| CN221326633U true CN221326633U (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322898836.5U Active CN221326633U (en) | 2023-10-27 | 2023-10-27 | Current temperature drift calibrating device |
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| CN (1) | CN221326633U (en) |
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- 2023-10-27 CN CN202322898836.5U patent/CN221326633U/en active Active
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